Not a fully functional game?

So, I downloaded Resident Evil 2 (for GameCube) and tested it, there were a few parts where the audio failed, but they seemed to be few and far between. Content with this, I downloaded Resident Evil 3 (also for GameCube), but here it would seem that only the SFX works, both the voice and BGM play for a fraction of a second before suddenly stopping.
Is there some way to fix this? If not, is there some way I can request a fix or new ISO?

"Ada, wait!"